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最近我国许多省市出现了禽流感，北京首例H7N9禽流感患者于4月17日出院回家，该病是由H7N9流感病毒引起的一种呼吸道传染病．据报道：国药集团紧急启动人用H7N9禽流感疫苗研制工作，注射H7N9禽流感疫苗可使人体获得对H7N9流感的免疫力．请结合生物学有关知识，回答下列问题： （1）从传染病的角度来看，H7N9流感病毒属于______． A．传播途径　　　　　B．病原体　　　　　C．传染源　　　　　　D．抗体 （2）注射H7N9疫苗属于预防传染病措施中的______． （3）注射H7N9流感疫苗会刺激人体产生特异免疫反应，从而产生抵抗H7N9流感病毒的______． （4）H7N9禽流感是由于感染了H7N9流感病毒引起的，病毒的基本的结构特点是无细胞结构，只有______外壳和内部的遗传物质核酸组成．
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